Assalamu 'alaykum Wa Rahmathullah Wa Barakathuhu
I would definitely recommend museums- especially Topkapi Palace- giving a guided tour of priceless possessions of the Prophet (sallal lahu 'alaihi wasalam), his companions, the awliya etc. I would suggest a tour which lasts more than 1 day, so that the history of eacg object can be discussed in detail with the opportunity to see them close up (e.g the Prophet's (sallal lahu 'alaihi wasalam) hair, the staff of Musa ('alaihis salam), Abu Bakr (radhiallahu anhu) hair etc).
Also the history of the Caliphate and Islamic empire would be good and definitely a tour of Islamic achievements in art, mathematics etc by showing relevant parts of Turkey to demonstrate etc.
Let me know if you decide to do the tour- I might be interested, Insha Allah!